Prospects for strong coupling measurement at hadron colliders using soft-drop jet mass

Hannesdottir, Holmfridur S.; Stewart, Iain W.; Pathak, Aditya; Schwartz, Matthew D.

Preprint

PUBDB-2022-05051

Prospects for strong coupling measurement at hadron colliders using soft-drop jet mass

Hannesdottir, H. S. (Corresponding author) ; Pathak, A.DESY* ; Schwartz, M. D. ; Stewart, I. W.

2022

[10.3204/PUBDB-2022-05051]

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-05051

Report No.: DESY-22-156; MIT-CTP-5461; UWThPh 2022-15; arXiv:2210.04901

Abstract: We compute the soft-drop jet-mass distribution from $pp$ collisions to NNLL accuracy while including nonperturbative corrections through a field-theory based formalism. Using these calculations, we assess the theoretical uncertainties on an $\alpha_s$ precision measurement due to higher order perturbative effects, nonperturbative corrections, and PDF uncertainty. We identify which soft-drop parameters are well-suited for measuring $\alpha_s$, and find that higher-logarithmic resummation has a qualitatively important effect on the shape of the jet-mass distribution. We find that quark jets and gluon jets have similar sensitivity to $\alpha_s$, and emphasize that experimentally distinguishing quark and gluon jets is not required for an $\alpha_s$ measurement. We conclude that measuring $\alpha_s$ to the 10% level is feasible now, and with improvements in theory a 5% level measurement is possible. Getting down to the 1% level to be competitive with other state-of-the-art measurements will be challenging.

Keyword(s): gluon, jet ; correction, nonperturbative ; quark, jet ; jet, mass ; p p, scattering ; sensitivity ; resummation ; higher-order ; precision measurement ; strong coupling ; hadron